/* ----------------------------------------------------------------------------
 * Easy!Appointments - Open Source Web Scheduler
 * 
 * @package     EasyAppointments
 * @author      A.Tselegidis <alextselegidis@gmail.com>
 * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
 * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3 
 * @link        http://easyappointments.org
 * @since       v1.0.0
 * ---------------------------------------------------------------------------- */

$(document).ready(function() {
    /**
     * Event: Add Appointment to Google Calendar "Click"
     * 
     * This event handler adds the appointment to the users Google
     * Calendar Account. The event is going to be added to the "primary"
     * calendar. In order to use the API the javascript client library 
     * provided by Google is necessary.
     */
    $('#add-to-google-calendar').click(function() {
        gapi.client.setApiKey(GlobalVariables.googleApiKey);
        gapi.auth.authorize({
            'client_id'     : GlobalVariables.googleClientId,
            'scope'         : GlobalVariables.googleApiScope,
            'immediate'     : false
        }, handleAuthResult);
    });
    
    /**
     * This method handles the authorization result. If the user granted access
     * to his data, then the appointment is going to be added to his calendar.
     * 
     * @param {bool} authResult The user's auth result.
     */
    function handleAuthResult(authResult) {
        try {
            ///////////////////////////////////////////////////////////
            console.log('Google Authorization Result: ', authResult);
            ///////////////////////////////////////////////////////////
            
            if (authResult.error) {
                throw 'Could not authorize user.';
            }
            
            // The user has granted access, add the appointment to his calendar.
            // Before making the event.insert request the the event resource data
            // must be prepared.
            var appointmentData = GlobalVariables.appointmentData;
            
            appointmentData['start_datetime'] = GeneralFunctions.ISODateString(
                    Date.parseExact(appointmentData['start_datetime'], 
                    'yyyy-MM-dd HH:mm:ss'));
            appointmentData['end_datetime'] = GeneralFunctions.ISODateString(
                    Date.parseExact(appointmentData['end_datetime'], 
                    'yyyy-MM-dd HH:mm:ss'));

            // Create a valid Google Calendar API resource for the new event.
            var resource = {
                'summary'   : GlobalVariables.serviceData['name'],
                'location'  : GlobalVariables.companyName,
                'start'     : {
                    'dateTime': appointmentData['start_datetime']
                },
                'end'       : {
                    'dateTime': appointmentData['end_datetime']
                },
                'attendees' : [
                    {
                        'email'         : GlobalVariables.providerData['email'],
                        'displayName'   : GlobalVariables.providerData['first_name'] + ' '
                                            + GlobalVariables.providerData['last_name']
                    }
                ]
            };

            gapi.client.load('calendar', 'v3', function() {
                var request = gapi.client.calendar.events.insert({
                    'calendarId'    : 'primary',
                    'resource'      : resource
                });

                request.execute(function(response) {
                    /////////////////////////////////////////////////
                    console.log('Google API Response:', response);
                    /////////////////////////////////////////////////
                    
                    if (!response.error) {
                        $('#success-frame').append(
                            '<br><br>' +
                            '<div class="alert alert-success col-xs-12">' +
                                '<h4>' + EALang['success'] + '</h4>' +
                                '<p>' +
                                    EALang['appointment_added_to_google_calendar'] + 
                                    '<br>' + 
                                    '<a href="' + response.htmlLink + '" target="_blank">' + 
                                        EALang['view_appointment_in_google_calendar'] +
                                    '</a>' + 
                                '</p>' +
                            '</div>'
                        );
                        $('#add-to-google-calendar').hide();
                    } else {
                        throw 'Could not add the event to Google Calendar.';
                    }
                });
            });
        } catch(exc) {
            // The user denied access or something else happened, display 
            // corresponding message on the screen.
            $('#success-frame').append(
                '<div class="alert alert-danger col-xs-12">' + 
                    '<h4>' + EALang['oops_something_went_wrong'] + '</h4>' + 
                    '<p>' + 
                        EALang['could_not_add_to_google_calendar'] +
                        '<pre>' + exc + '</pre>' +
                    '</p>' +
                '</div>');
            console.log('Add To Google Calendar Exception', exc);
        }
    }   
});